文件名称:n_yueshu
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(一)
求a~b 之间各个数的约数个数之和。(其中包括a和b在内)
ans = sigma(f(i)) , (a <= i <= b) , 其中f(i)表示i的约数的个数 -(A) for a ~ b between the various numbers about the number and the number of. (Including a and b included) ans = sigma (f (i)), (a <= i <= b), which f (i) that the i s about the number of number of
求a~b 之间各个数的约数个数之和。(其中包括a和b在内)
ans = sigma(f(i)) , (a <= i <= b) , 其中f(i)表示i的约数的个数 -(A) for a ~ b between the various numbers about the number and the number of. (Including a and b included) ans = sigma (f (i)), (a <= i <= b), which f (i) that the i s about the number of number of
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正整数n的约数问题.cpp
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